The image display apparatus includes an optical system causing a light flux entering from an original image by being transmitted through a fifth surface to reflect at a fourth surface, a third surface, a first surface and a second surface and then cause the light flux to be transmitted through the first surface and exit toward an exit pupil, causing the light flux to form an intermediate image and causing optical paths to intersect with each other. The optical system satisfies 0.62≦L12/f≦5.00 and 1.80≦L45/L12≦5.00. When a distance between hit points of a central-view-angle principal ray on the surfaces is referred to as a hit point distance, L45 represents a hit point distance between the fourth and fifth surfaces, L12 represents a hit point distance between the first and second surfaces, and f represents a focal length of the optical system.
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3. An image display apparatus according to claim 1 , wherein the second surface has a positive optical power.
An image display apparatus includes an optical system that projects light from an original image. The light passes through a fifth surface, reflects off a fourth, third, first, and second surface, exits through the first surface, and forms an intermediate image where optical paths intersect. The optical system's parameters meet the following criteria: 0.62≦L12/f≦5.00 and 1.80≦L45/L12≦5.00, where L45 is the distance between where a central ray hits the fourth and fifth surfaces, L12 is the distance between where a central ray hits the first and second surfaces, and f is the focal length. The second surface has a positive optical power, meaning it converges light rays.
4. An image display apparatus according to claim 1 , wherein at least one of the first to fifth surfaces is a rotationally asymmetric surface.
An image display apparatus includes an optical system that projects light from an original image. The light passes through a fifth surface, reflects off a fourth, third, first, and second surface, exits through the first surface, and forms an intermediate image where optical paths intersect. The optical system's parameters meet the following criteria: 0.62≦L12/f≦5.00 and 1.80≦L45/L12≦5.00, where L45 is the distance between where a central ray hits the fourth and fifth surfaces, L12 is the distance between where a central ray hits the first and second surfaces, and f is the focal length. At least one of the five optical surfaces (first through fifth) is a rotationally asymmetric surface, which allows for more complex and precise control of the light path than a standard, symmetrical lens.
5. An image display apparatus according to claim 1 , wherein the first surface causes the light flux from the third surface to be internally totally reflected and causes the light flux from the second surface to be transmitted without causing the light flux to be internally totally reflected.
An image display apparatus includes an optical system that projects light from an original image. The light passes through a fifth surface, reflects off a fourth, third, first, and second surface, exits through the first surface, and forms an intermediate image where optical paths intersect. The optical system's parameters meet the following criteria: 0.62≦L12/f≦5.00 and 1.80≦L45/L12≦5.00, where L45 is the distance between where a central ray hits the fourth and fifth surfaces, L12 is the distance between where a central ray hits the first and second surfaces, and f is the focal length. The first surface internally reflects light coming from the third surface (total internal reflection), but transmits light coming from the second surface without causing total internal reflection. This controls which light paths are reflected and which are transmitted.
6. An image display apparatus according to claim 1 , wherein an angle of view of the display optical system is 50° or larger.
An image display apparatus includes an optical system that projects light from an original image. The light passes through a fifth surface, reflects off a fourth, third, first, and second surface, exits through the first surface, and forms an intermediate image where optical paths intersect. The optical system's parameters meet the following criteria: 0.62≦L12/f≦5.00 and 1.80≦L45/L12≦5.00, where L45 is the distance between where a central ray hits the fourth and fifth surfaces, L12 is the distance between where a central ray hits the first and second surfaces, and f is the focal length. The display optical system provides a wide field of view of 50 degrees or more.
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July 19, 2016
October 24, 2017
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